Phone factors

Going off the results, mobile phones seem especially popular with the millennial crowd, as the study also found that a whopping 70% of adults aged 25-34 didn't use landlines.

Living situation also played a role, as a majority of adults who rented their homes and more than four in every five adults living with roommates or other unrelated adults were wireless-only. Makes sense, given it's another utility bill to split among people who may prefer having their own personal number anyway.

The Health Department's findings also found income to be a factor, saying that approximately two-thirds of those living in poverty didn't use landlines in comparison to those with higher income.

While it's surprising that landlines are still holding in the face of smartphones (as well as voice-over-IP alternatives like MagicJack) it's no shock that wireless is becoming the new standard in American homes — and how could you blame them? That's where all the apps are.